Typewriter-ribbon spool



Aug. 5A. 1924. @503,395

DE WITT c. HARRIS TYPEWRITER RIBBON SPOOL Filed March 22 1922 Patented Aug. 5, 1924.

heeded@ UNITED sT'ATEsrArENT orties.

nn wIrrlv c. HARRIS, or PINELAND, FLORIDA.

TYPEWRI-TER-RIBBON SPOOL.

Applicationled March-22, 1922. Serial N'o. 545,645.

To, all whom t may concer/rt;

' off changing, the.` ribbon.`A

More speevficallystated, one` of. the; oh-v jects;A of the invention to.l provide animpioved spool` which. comprises;an. upperseotiQIl; that is demollntablef simply by pulling "upwardly thereon` and which is; yieldingly secured 1 inflocked engagement with.` they lowerV Section by means of spring detents auto;-Y

ma-tically withdrawable when the fupper; sec-V tion is; raised. j

Another object isyto provide an improvedY construction: ofjand.;relationshipbetweenLthe lower section of the ribbon spool and:` the removable ribbon core which is-'Ymounted thereon. u Y

'lrhe invention also aims to provideaspool of; extremely simple andl durable construeV` tion; which mayl be cheaply manufacturedand WhChhaS other. advantages that willgloe` understood fromL the. fol-lowingA detailed de? scripticn. Y Y

InV the accompanying drawings, Figure;

1 is,- a plan view, and Fig. 2` a verticalaX-ial sectional view ot` a. ribbonzspooll embodying-` the features of my invention.

VFig. 3 is a horizontal section throughthe spool; in the plane of, line 3 3l of Fig. 2

with the holding dogs and'spring` omitted.

Fig.- Lisa fragmentary elevation of the;

lowerl spoolv section Vshowing the ribbony core; in cross {sec/tion.

I have illustrated in the drawings and; will. herein describe in detail the preferredone of manypossible embodiments ot myy invention but; l do not` intendV this specific disclosure as a limitation on the definition of the scopeof the invention which willbe pointed Aout inthe appended claims;

The exemplary embodiment of the-inven tion shown in thedrawings comprises upper and lower sections arranged; to, be readily' separated. The lower section comprises a hub=5 which 1s arranged to be secured upon Vthe upper end of a shaft 6, the hub or the shaft being suitably mounted for rotation in a typewriter frame. @nVv this hub is fixed a lower circular plate 7 which is centrally apertured to receive the said hub, To the upper end of this hub is fixed a collar 8 which is provided with an annular groove 9 and a, pair of diametrically opposed apen tures 10 locatedin the samev horizontal plane as: and registering with said groove. A pin 11 is suitably iiXed with relation to the lower platef and the collar 8, in the present in# stance by securing the lower end of the pin in aV socket in the-platey 7.

l Theuppervspool section comprises-a plate 12 ofi circular form which may, if desired, haye, openings 131 therein through which the ribbon on the spool ywill be Visible. This plateis preferablyl formed of sheet metal stamping; andAA is provided with a recess 14 formed in the stamping operation to aii'ord aV cup for receiving the end of the operators linger to facilitate turningl the spool. This cup comprises a rim portion 15 ,rising from the plane of the plate and a centralportion 1.6- depressedY from the upper edge of said rim, the bottom of said central portion lyingfapproximately in theplane of the plate.

A cylindrical member 17 which is preferably-intheiform of aninverted cup is se cured tothe lower side` of the topl plate 12 coaxial therewithby suitable means such as arivet 1 8V passing" through the plate and the end wall of the; cup. TheeXternal diameter of the Vcup is slightly lessthan the internal diameter of the collar 8 so` that the cup maybe readily inserted into and withdrawn from said collar. The cup 17 has diametri` cally'opposed apertures 19 through which a pair of holding dogs 2O project, each of saiddogs having a head preferably conical in shape andeach dog having av stem at its inner end offless. diameter than said head. A coiled compression spring 21 extends diametrically acrossl the cup and at its opposite. ends receives the two sterns'of said dogs and urges, thel dogsY apart. The apertures 19V inthe 'cup are slightly smaller than the largest diameter of the dogsso that when the upper plate 1Q of thespool and the cup are withdrawn `from the lower section, the dogscannot'escape through the apertures 19. lVhen the spool is assembled the ends ofthe dogs eng-age inthe apertures 10 in the collar 8 Vand lock the two sections together.

The ribbon 22 is wound upon a core 23 which may be made of wood, said core being arranged to fit over the collar 8 and having a notch or groove 24 arranged to receive the pin 11 so as to prevent relative rotation between the lower spool section and the core. The ribbon may be secured on the core by means `of an arcuate spring slip 25 which binds the first lap of the ribbon to thecore, the succeeding laps being wound upon said cli Vhen the operator desires to change ribbons he simply pulls upwardly onv the top plate 12 which causes the heads of the dogsk 20 to be cammed inwardly out of engage--y ment'with the apertures l0 in the collar 8, whereupon the top plate may be fully withdrawn and laid aside. The core 23 and the body of the ribbon thereon is then lifted off the lower spool section and another core with ribbon wound thereon is put into its place. The top plate is then replaced by inserting the cup 17 into the collar 8 until the ends of the dogs 2O snap into their apertures 10 in thecollar 8. lIn case theV top plate is not placed in such position i with the dogs registering with the apertures 10, said dogs will engage in the groove 9 and the top plate 1Q may then be rotated until the dogs engagev in said apertures. The dogs 20 are forced inwardly by the upper end of the collar 8 when the cup 17 is first inserted into said collar.

I claim as my invention:

l. A typewriter ribbon spool comprising two separable sections7 the ylower section including a central tubularhubadapted to be mounted upon a driving shaft, a plate centrally apertured to receive and to be secured to said hub, a collar i'iXedV to said hub above said plate and having a pair of diametrically opposed apertures, the upper section of the spool comprisingV a top plate, an inverted cup-shaped member located beneath said plate and having its end wall secured tothe center of said plate, said cup ybeing adapted to telescope into the upper end of said collar and the cup having dia.- inetrically opposed openingsin its tubular portion arranged to register in said apertures in the collar, a pair of opposed dogs located inside of said cup member and'comprising conical heads projecting partially throughrthe openings in said member and arranged to engage in the apertures in said collar, said dogs further comprising stems of reduced size on their inner ends, and a coiled Vspring having its ends receiving said stems and urging said dogs outwardly, said dogs being arranged to yield inwardly to permit the upper spool section tobe withdrawn from or associated with the lower section.

2. Atypewriter ribbon spool compris- `said plate. and having a pair of diametrically opposed apertures, the upper sect-ion V ofthe spoolcompiising a top plate, a tubu lar member located beneath and centrally secured to`said plate, said' tubular member being adapted to telescope into the upper end of said collar and the said member having diametrically opposed openings in its tubular portion arranged to register Y Y with said apertures in the collar, a pair of Y opposed dogs-located inside of said tubular member and comprising cam portions projecting partially through the openings in said member and arranged to engage in the apertures insaid collar, and a coiled spring Y having itsends engaging and urging saidl dogs outwardl said'dogs being arranged to yield inwardly to permit the upper spool section to be Ywithdrawn from or associated with the lower section.

3. A typewriter ribbon lspool comprisingv upper and lower separable sections, the lower 90 section having anupstanding tubular part andthe upper section having a depending V tubular part arranged to telescope into the first mentioned tubular part, said tubular parts having diametrically Y opposed aper'- 95 tures arranged to` register, and a pair of opposedv spring presseddogs carriedby *theY upper tubular part and arranged. to ,passV i through the apertures therein and into engagement with the apertures in the lower tubular part to lock spool sections together.

4c. A typewriter ribbon spool comprising upper and lower separable sections havingtubular parts arranged to telescope with each other, said tubular parts 'having apertures arranged'to register, and yielding means carried by one ofV said tubular parts and ar-V ranged to project through'its aperture into the aperture in the other part for locking the two spool sections together.V Y f Y Y `5. A' typewriter ribbonl spool comprising upper and lower separable sections comprisf ing telescoping tubular par-ts having aper-V tures arranged to register and a pair of opposed spring pressed dogs carried by the inner part and having conical heads arranged to vproject 'through the apertures in, the vinner part andengage in the aperturesV in the outer part for securing the spool` sec- 120 v said groove and the first-mentioned aperture and having a. dog arranged to engage in the two apertures when in register or in said groove when the apertures are not in register.

I?. A typewriter ribbon spool comprising upper and lower separable sections having telescoping portions, one of which carries a yielding dog to engage the other, an upright pin fixed to the lower section adjacent to the periphery of the telescoping portion thereon, and a removable ribbon core having a central opening to receive said telescoping sections and also having a vertical groove registering with said opening to receive said pin and thereby prevent relativeV rotation between Said core and the lower sections.

8. A typewriter ribbon spool comprising an upper section which includes a top plate and a depending tubular part secured to the under side of said plate, said part having an aperture therein and a spring pressed dog within said part normally projecting through said aperture.

9. A typewriter ribbon spool comprising an upper section which includes a top plate and an inverted cup centrally secured to the under side of said plate, said cup having diametrically opposed openings in its tubular portion, a pair of dogs within said cup having parts projecting through said openings and a spring withinV said cup having its ends bearing against said dogs and urging them outwardly.

In testimony whereof, I have hereunto aiixed my signature.

DE WITT C. HARRIS. 

